HL-R5067W - Unit shuts off sporadically,remote or power button on the TV will not turn unit off,thus I have to unplug unit to turn off.I can hear what sounds like arcing from the unit when it first powers up ,any comments or suggestions before I call service Tech. in .I am also technically inclined (electronic Technician at a local TV station ).I must admit I did not expect to have trouble with this set so soon !...let me know before I take the rear cover off to troubleshoot as someone might have already solved this problem. ---MG.